Density plots illustrating the parallax and proper motion cleaning of the dereddend CMD for stars in Baade’s window. Left: all sources with reliable BDBS photometry and Gaia EDR3 astrometry. Middle: same as middle panel in Fig. 4, ϖ-background sources surviving the Gaia EDR3 parallax cuts. Right: subset of the ∼3.3 × 10⁵ sources with Gaia EDR3 proper motions consistent with a bulge membership, according to the GMM. The blue histograms above the CMDs represent the corresponding normalized distributions of (g − i)₀ for stars brighter than i_0, max − 3σ_i = 16.1 (shown as a horizontal dashed line in all three plots). The dashed curves correspond to the two fitted Gaussian distributions, and the black curve to their sum. The corresponding value of f_B (the ratio between blue and red stars) is reported in each panel.